I presumed that Fox sag recommendations were based on sag measured when seated. When seated, a lot more of your weight is supported by the rear wheel, so it would sag to something more like 20% when standing.
Self-defined optimal performance aside, every rider should do "bracketing", which are tests to feel what you like better in back to back tests. This is highly subjective and personal. I personally hate a fork that dives/wallows. I also don't aim for using full travel on a typical ride, preferring it to only use full travel on rare hard hits, and have a particular feature with a lot of freefall and a front wheel first impact to test on. I basically want a fork that I have confidence in, where I use the brakes less, and usually that means a high level of predictability and support. I credit geo preservation as the reason why I run relatively firm suspension, rather than aiming for some arbitrary sag %. I get defensive and firm up my own body if I feel the bike is pitching me over due to the dive. I also feel compelled to hold back on putting out pedal power out-of-the-saddle if it's bobbing too easily. These things hold me back more than small bumps; small bumps actually remind me to loosen up, and get me in a mindset to ride better, focusing on higher priorities. Rather not get into the habit of firming up my own body, and getting back, not trusting in my bike and compromising my readiness to use technique.
I used to pump my fork to have my riding weight in kg to reach a starting point, but that's changed with EVOL (and Debonair). If you're not sure, you can use shockwiz to assist with your susp tuning. Wouldn't worry about the actual # except to tune that specific fork again, but more about the performance you feel on the trail. It could very well be different from expectations. I haven't used the emtb Fox 36, so am just generalizing. Part of my generalization is based on knowledge that adding a Vorsprung air piston in the same fork requires more air pressure due to even greater negative air volume.
P.S. Stiffer forks corner better. Dual crown forks, including lefty, and rigid and shorter travel versions of big forks like the Lyrik, all corner noticeably easier. Also tracking the ground isn't necessarily the best. Skipping over holes, rather than tracking into them, is way to remove spiky feedback. You can skip over them with technique and speed, but you'll need a firmer spring for those anyways. Being on the brakes too much leads to arm pump--better to trust the bike, rather than to contribute to braking bumps by clamping down in them. In the MX world, it's common for people to try and open/soften suspension in braking/washboard bumps, being confused about not being able to tune them out, but veterans recommend doing the opposite, increasing spring rate and compression damping. It goes from jackhammering (tracking entire bumps) to feeling like a series of shaved off humps (tracking the tops of bumps, where the damping rounds off the edges). Part of the theory is that the sound of the bumps makes the rider "feel" the impact, even if it's absorbed, and the way they react to the impact sounds is messing up their ride experience. A lot more than you think is mental...
TL;DR, long way of saying who cares about the specific amount of pressure. The same ride concept applies: go faster, and tune the fork to be firmer for such speed, and things will be easier and small bumps become more ignorable. It's a noob trap to soften up suspension, which would compel you to use the brakes more.
